drm/v3d: Handle error from drm_sched_entity_init()

[ Upstream commit 8cf1bec ]

drm_sched_entity_init() can fail but its return value is currently being
ignored in v3d_open(). Check the return value and properly unwind
on failure by destroying any already-initialized scheduler entities.

Fixes: 57692c9 ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patch.msgid.link/20260306-v3d-reset-locking-improv-v3-1-49864fe00692@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: mairacanal

drivers/gpu/drm/v3d/v3d_drv.c

@@ -130,7 +130,7 @@ v3d_open(struct drm_device *dev, struct drm_file *file)
 	struct v3d_dev *v3d = to_v3d_dev(dev);
 	struct v3d_file_priv *v3d_priv;
 	struct drm_gpu_scheduler *sched;
-	int i;
+	int i, ret;
 
 	v3d_priv = kzalloc(sizeof(*v3d_priv), GFP_KERNEL);
 	if (!v3d_priv)
@@ -140,9 +140,11 @@ v3d_open(struct drm_device *dev, struct drm_file *file)
 
 	for (i = 0; i < V3D_MAX_QUEUES; i++) {
 		sched = &v3d->queue[i].sched;
-		drm_sched_entity_init(&v3d_priv->sched_entity[i],
-				      DRM_SCHED_PRIORITY_NORMAL, &sched,
-				      1, NULL);
+		ret = drm_sched_entity_init(&v3d_priv->sched_entity[i],
+					    DRM_SCHED_PRIORITY_NORMAL, &sched,
+					    1, NULL);
+		if (ret)
+			goto err_sched;
 
 		memset(&v3d_priv->stats[i], 0, sizeof(v3d_priv->stats[i]));
 		seqcount_init(&v3d_priv->stats[i].lock);
@@ -152,6 +154,12 @@ v3d_open(struct drm_device *dev, struct drm_file *file)
 	file->driver_priv = v3d_priv;
 
 	return 0;
+
+err_sched:
+	for (i--; i >= 0; i--)
+		drm_sched_entity_destroy(&v3d_priv->sched_entity[i]);
+	kfree(v3d_priv);
+	return ret;
 }
 
 static void